pip命令注解，重点看wheel和check

root@020b1eed69d7:~# pip --help

Usage:
  pip <command> [options]

Commands:
  install                     Install packages.   #安装后面可以跟文件名，或者whl文件，或者连续的依赖文件名
  download                    Download packages.  #只下载不安装
  uninstall                   Uninstall packages. #卸载
  freeze                      Output installed packages in requirements format.  #以requirements格式列出已安装的模块
  list                        List installed packages.  #列出已经安装过的模块
  show                        Show information about installed packages.  #查看安装过的模块的具体信息，例如出处、安装路径等
  check                       Verify installed packages have compatible dependencies.#检查依赖性，比如whl文件
  config                      Manage local and global configuration. #配置项
  search                      Search PyPI for packages.  #查询
  wheel                       Build wheels from your requirements.  #创建一个wheel文件，根据requirements创建wheel
  hash                        Compute hashes of package archives.
  completion                  A helper command used for command completion.
  debug                       Show information useful for debugging.
  help                        Show help for commands.

General Options:
  -h, --help                  Show help.
  --isolated                  Run pip in an isolated mode, ignoring environment variables and user configuration.
  -v, --verbose               Give more output. Option is additive, and can be used up to 3 times.
  -V, --version               Show version and exit.
  -q, --quiet                 Give less output. Option is additive, and can be used up to 3 times (corresponding to WARNING, ERROR, and CRITICAL logging levels).
  --log <path>                Path to a verbose appending log.
  --proxy <proxy>             Specify a proxy in the form [user:passwd@]proxy.server:port.
  --retries <retries>         Maximum number of retries each connection should attempt (default 5 times).
  --timeout <sec>             Set the socket timeout (default 15 seconds).
  --exists-action <action>    Default action when a path already exists: (s)witch, (i)gnore, (w)ipe, (b)ackup, (a)bort.
  --trusted-host <hostname>   Mark this host or host:port pair as trusted, even though it does not have valid or any HTTPS.
  --cert <path>               Path to alternate CA bundle.
  --client-cert <path>        Path to SSL client certificate, a single file containing the private key and the certificate in PEM format.
  --cache-dir <dir>           Store the cache data in <dir>.
  --no-cache-dir              Disable the cache.
  --disable-pip-version-check
                              Don't periodically check PyPI to determine whether a new version of pip is available for download. Implied with --no-index.
  --no-color                  Suppress colored output
  --no-python-version-warning
                              Silence deprecation warnings for upcoming unsupported Pythons.